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// Copyright (C) 2017 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-do run { target c++11 } }
#include <algorithm>
#include <testsuite_hooks.h>
bool values[100];
unsigned next_id()
{
static unsigned counter = 0;
VERIFY(counter < 100);
return counter++;
}
struct value
{
int val;
const unsigned id;
value(int i = 0) : val(i), id(next_id()) { values[id] = true; }
value(const value& v) : val(v.val), id(next_id()) { values[id] = true; }
value& operator=(const value& v) { val = v.val; return *this; }
~value() { values[id] = false; }
};
bool operator<(const value& lhs, const value& rhs)
{
if (!values[lhs.id])
throw lhs.id;
if (!values[rhs.id])
throw rhs.id;
return lhs.val < rhs.val;
}
bool operator==(const value& lhs, const value& rhs)
{
if (!values[lhs.id])
throw lhs.id;
if (!values[rhs.id])
throw rhs.id;
return lhs.val == rhs.val;
}
// A forward iterator that fails to meet the requirement that for any
// two dereferenceable forward iterators, a == b implies &*a == &*b
struct stashing_iterator
{
typedef std::forward_iterator_tag iterator_category;
typedef value value_type;
typedef value_type const* pointer;
typedef value_type const& reference;
typedef std::ptrdiff_t difference_type;
stashing_iterator() : ptr(), stashed() { }
stashing_iterator(pointer p) : ptr(p), stashed() { stash(); }
stashing_iterator(const stashing_iterator&) = default;
stashing_iterator& operator=(const stashing_iterator&) = default;
stashing_iterator& operator++()
{
++ptr;
stash();
return *this;
}
stashing_iterator operator++(int)
{
stashing_iterator i = *this;
++*this;
return i;
}
reference operator*() const { return stashed; }
pointer operator->() const { return &**this; }
bool operator==(const stashing_iterator& i) const { return ptr == i.ptr; }
bool operator!=(const stashing_iterator& i) const { return !(*this == i); }
private:
void stash()
{
if (ptr)
stashed = *ptr;
}
pointer ptr;
value_type stashed;
};
void
test01()
{
value s[] = { 0, 1, 2, 3, 4, 5 };
std::search(s, s+6, stashing_iterator(s), stashing_iterator(s+4));
}
int
main()
{
test01();
}
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